Proper location for contrib modules translation files

Hello,

I have question regarding Drupal 7 and .po files. I have determined that all contrib modules contain folder /translations with .po files which I want to move outside the contrib module as they are not part of the modules git repos. My question is what is the proper location for contrib modules translation files and what format should be kept, what is the naming convention. Is it okay to move all translation files into sites/all/translations and name them {module-name_version_language.po} ?